That's good advice from Appleby (as usual).
A no cost way to get a lot of answers about Roths is to check out a book or two from the library. Basic books on investing will have a chapter on Roth IRA's, and there are books that talk about nothing but Roths.
One thing you should know is that all the Roth accounts to which you contribute are treated as one Roth. You may have contributed to several Roth IRA's at one or more fund companies, but when you take your money out, they all get lumped together as if they were your one big Roth.
For example, before you can take money out of a Roth free of taxes, you have to have had a Roth for at least 5 years and you have to be over the age of 59-1/2 (or disabled or dead or in some cases for a first time home purchase). So, if you started that first Roth IRA more than 5 years ago, that counts for all your other Roth IRA's. The 5 year wait does not start over for each new Roth account to which you contribute. (An important exception is that a conversion of a traditional IRA to a Roth IRA has its own 5 year waiting period.)
You might find the following link useful. It has examples that make things more clear.
http://www.fool.com/money/allaboutiras/allaboutiras06.htmand this link has a list of what happens in what order when you take money out of your Roth:
http://www.schwab.com/public/schwab/invest...lvl2=retirementHope this helps.